Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.

Supposed the linked list is 1 -> 2 -> 3 -> 4 and you are given the third node with value 3, the linked list should become 1 -> 2 -> 4after calling your function.

思路：单向链表，只给出要删除的结点的指针。因为我们无法获得要删除的节点的上一个结点的地址，所以就把要删除结点的下一个结点的值复制到要删除的节点，然后删掉要删除结点的下一个结点。

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